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Finding the Fourth Proportional to 319.41, 479.12 and 136.80

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Solution

The fourth proportional to 319.41, 479.12 and 136.80 is: 205.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.41 : 479.12 = 136.80 : x
  2. Step 2: Convert to fraction form
    319.41/479.12 = 136.80/x
  3. Step 3: Cross multiply
    319.41x = 479.12 × 136.80
  4. Step 4: Simplify right side
    319.41x = 65,542.93
  5. Step 5: Solve for x
    x = 65,542.93/319.41
  6. Step 6: Final answer
    x = 205.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.